Question

Calculate the value of $A$ (A is acute angle),in degrees if $(sec2A-1)(cosec3A-1)=0$

Answer 1

$(sec2A-1)(cosec3A-1)=0$
$sec2A=1$ or $cosec3A=1$
$2A=0$ or $3A=90$
$A=0$ or $A={30}^{\circ }$
Thus, $A=0^{\circ }or{30}^{\circ }$